This article investigates structural aspects of source domains in metaphorical mappings with regard to their manifestation in public discourse data. Specifically, it analyses the organization of source concepts into mininarratives or "scenarios" that dominate the discourse manifestations of source domains. The material consists of examples from a bilingual corpus of British and German public debates about the &European Union.& The data show that while the two national samples share some basic mappings between the source and target domains, they each are characterised further by specific scenarios that provide focal points for conceptualizing the target topic. The scenarios can also be shown to carry evaluative and attitudinal biases that are related to particular political dispositions and preferences of the respective national discourse communities. In conclusion, it will be argued that the analysis of scenarios is a necessary complement to the study of source domains and of domain-mappings in metaphorical language use.